The trio have joined a gaggle of famous faces channelling their artistic side in aid of children's charity Coram

Calling all Cumberbatch and Hiddleston fans (we know you're out there!) It's your chance to raise some money for charity – AND to own some artwork created by the actors themselves.

The pair are among a gaggle of famous faces who have designed – and signed – cards to go on eBay from tomorrow (6 May). The auction will last for ten days, until 16 May, with all proceeds raised going to children's charity Coram.

The Cards for Keeps initiative, launched by Stampin' Up! UK, has also drawn support from the likes of Arthur Darvill, Karl Pilkington, Joseph Fiennes, Jo Brand and Rachel Riley. You can bid in the auction here but if you want to first browse your choices – and check out some of the messages inside – have a glance through the gallery below...